Machine for cutting square holes



(No Model.)

W. 0. GUNOKEL. MACHINE FOR CUTTING SQUARE HOLES.

o. 417,174. Patented-Dec. 10, 1889.

lmitmaooao Smoeml'oc Wm 415% %/y 0. M05 7 1 1 abto'omm UNITED STATES PATENT OFFICE.

\VINFIELI) O. GUNOKEL, OF TERRE llAU'l l, INDIANA.

MACHINE FOR CUTTING SQUARE HOLES.

SPECIFICATION forming part of Letters Patent No. 417,174, dated December 10, 1889. Application filed January 25, 1889. Serial No. 297,512. (No model.)

Be it known that I, WINFIELD O. GUNCKEL, a citizen of the United States, residing at Terre Haute, in the county of Vigo and State of Indiana, have invented certain new and useful Improvements in Machines for Cutting Square Holes; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to machines for cutting square holes in wood 5 and it consists in the novel construction and combination of the parts, hereinafter fully described and claimed, whereby the cutters are oscillated.

In the drawings, Figure 1 is a front View of the device. Fig. 2 is a side view of one of the eccentrics and yokes for operating the cutter-head, drawn to a larger scale. Fig. 3 is a plan view of the two double eccentrics, showing the yoke in section.

A is a frame provided with the bearings (1 in which the shaft B is journaled, and C is the cutter-bar dependin from the lower part of frame A.

I) is the oscillating (JllhtGldlCttl, pivoted upon pin (l at the lower end of the cuttenbar.

E are the outwardly and upwardly project- .ing cutters, secured to the bottom of the cutter-head by the cap E, having the dovctailed portion a fitting between the ends of the cutters. The cap is provided with one or more screws 6, which are screwed into the cutter-head from below, and have their heads countersunk into the cap between the two cutters.

F I are two rods pivoted to the cutter-dread by pins f upon opposite sides of the pivotpin (I.

G is a pair of similar eccentrics, having the concentric sleeveg and the groove g between them.

H is a second pair of similar eccentrics, arranged opposite to the aforesaid eccentrics G, and having the concentric sleeve 71 and the groove h between them.

The eccentrics G- and II are united by the sleeve 1, and all the eccentrics are cast in one piece, or the said eccentrics are otherwise rigidly secured together andare keyed or otherwise secured upon shaft B. a

J are yokes having the upper endsof rods F screwed into them or otherwise firmly securedto them. These yokes are guided in the grooves g and h between the eccentrics by the sleeves g and h, which are concentric with the shaft B. The upper ends j of the yokes are made round and have screw-threads 7" out upon their extreme ends.

K are caps, provided with holes 7c, which slide upon the round endsj of the yokes, and K are nuts for keeping the caps in position.

L are rollers, provided with spindles E, which are journaled in bearings l on the sides of the caps, the middle portions of the caps having hollows 7c in them to clear the rollers. The rollers extend across and bear against the faces of the eccentrics upon both sides of the yokes to which they are connected.

Rotary motion is communicated to the shaft 13 by any convenient means commonly in use in wood-working machines-much as crank handles or belt-pulleys thereby causing the cutters to oscillate and cut a square or rectangular hole in any piece of wood against .which they are thrust. The device is fed downward as the cutting proceeds; or the wood may be fed upward against the cutters.

The feeding devices do not form a part of the presentinvention, and any approved construction of feeding mechanism commonly in use in woodworking machines may be utilized for this purpose.

The eccentrics cause the cutters to be oscillated, and the amount of oscillation in either direction may be varied or equalized by turning the nuts K, thereby drawing the cutters to one side or the other, as may be found to give the best result.

Cutters of differentlength or width may be inserted to cut holes of different sizes, and the cutters maybe adjusted bylooscning the cap-screws andplacing packing behind the ends of the cutters.

\Vhat I claim isl. The combination, with the supportingframe and the cutter-bar, of the cutter-head pivoted to the cutter-bar, the grooved. eccentrics secured upon opposite sides of a shaft journaled in said frame, and the reciprocating rods pivoted at their lower ends to the cutter-head and having their upper ends forked and guided-by the grooves in said eccentrics, by which they are directly operated, substantially as set forth. 1

2. The combination, with the supportingframe and the cutter-bar, of the cutter-head provided with cutters and pivoted to the lower end of the cutter-bar, a revoluble shaft journaled in the frame, eccentrics secured on opposite sides of the said shaft, and reciprocating rods pivoted to the cutter-head and provided with adjustable ends and with rollers bearing against the said eccentrics, whereby the cutters may be oscillated more or less in either direction, substantially as set forth.

3. The combination, with the cutter-bar, of the oscillating cutter-head pivoted to the cutter-bar, the two upwardly and outwardly projecting cutters at the bottom of the cutterliead,-and the cap provided with a dovetailed portion fitting between the ends of the cutter'sand with one or more screws engaging with the cutter-head between the cutters for clamping" them in position, substantially as set forth.

4. The combination, with the oscillating cutter-head, of the reciprocating rods pivoted to the cutter-head, the yokes secured to the ends of the said rods, the revoluble eccentric separated by grooves in which the said yokes are guided, and the rollers connected to the upper ends of the yokes and bearing against the eccentrics on each side of the grooves, substantially as set forth.

5. The combination, with the oscillating cutter-head, of the reciprocating rods pivoted to the cutter-head, the yokes secured to the ends of the said rods, the caps provided with rollers and secured to the ends of the yokes, and the revoluble eccentrics bearing against the said rollers and provided with grooves and with concentric sleeves for guiding the said yokes in the grooves, substantially as set forth.

In testimony whereof I affix my signature in presence of two witnesses.

\VINFIELD O; GUNCKEL.

fitnesses p EDWIN S. GOBIN,

S. E. COTTON. 

